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Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

A tail from a different individual - the tail of each humpback whale is visibly unique. A tail from a different individual - the tail of each humpback whale is visibly unique.
The brain. (a) Superior (top) view. (b) Sagittal view of a sectioned brain to reveal internal featur The brain. (a) Superior (top) view. (b) Sagittal view of a sectioned brain to reveal internal featur
Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Characteristics of the individual determine (a) whether they will be exposed to certain stressors ... Characteristics of the individual determine (a) whether they will be exposed to certain stressors ...
Race-Ethnicity of the U.S. Population Race-Ethnicity of the U.S. Population
Niche: An individual’s ecological role Niche: An individual’s ecological role
Video: Endocytosis - pinocytosis, receptor mediated and Transcytosis

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